CN111912578A - Suction gun leakage detection device and leakage detection method - Google Patents

Suction gun leakage detection device and leakage detection method Download PDF

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Publication number
CN111912578A
CN111912578A CN202010844979.6A CN202010844979A CN111912578A CN 111912578 A CN111912578 A CN 111912578A CN 202010844979 A CN202010844979 A CN 202010844979A CN 111912578 A CN111912578 A CN 111912578A
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CN
China
Prior art keywords
suction
gun
air
suction gun
leak detection
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CN202010844979.6A
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Chinese (zh)
Inventor
林琦武
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Guangzhou Know How Industry & Equipment Co ltd
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Guangzhou Know How Industry & Equipment Co ltd
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Priority to CN202010844979.6A priority Critical patent/CN111912578A/en
Publication of CN111912578A publication Critical patent/CN111912578A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
    • G01M3/202—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material using mass spectrometer detection systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

The invention provides a suction gun leakage detecting device and a leakage detecting method, wherein the suction gun leakage detecting device comprises: the suction gun device comprises a suction gun body and a suction device, the suction device is connected with the inside of the suction gun body, and the suction device provides negative pressure airflow for the suction gun body; the spray gun device comprises an air injection gun body and an air supply device, the output port of the air injection gun body faces the front end of the output port of the air suction gun body, the air supply device is connected with the inside of the air injection gun body, and the air injection gun body provides positive pressure air flow for the air injection gun body; and the leakage detecting unit is connected with the air suction device. When the suction gun device moves to a real leakage point, the signal of the detection unit can be obviously enhanced, so that the real leakage point can be accurately found.

Description

Suction gun leakage detection device and leakage detection method
Technical Field
The invention belongs to the technical field of leakage detection, and particularly relates to a suction gun leakage detection device and a leakage detection method.
Background
In the prior art, along with the development of scientific technology, no matter in the technical field of vacuum or high-pressure air tightness engineering, the air tightness requirement of a part or a system is improved along with the development of the scientific technology, so that the research on improving the air tightness detection precision and influencing the air tightness factor is very urgent.
In the past, when a large leakage point position is searched, a water detection method, a bubble brushing method and the like exist, but a suction gun leakage detection method is needed under certain specific requirements, such as the working condition that a workpiece cannot contact liquid such as water, oil and the like. When the workpiece to be detected has large leakage (large leakage hole or gap) to a certain degree, a large amount of leakage detection gas exists near the leakage hole due to the diffusion of the gas, under the condition, when the suction gun device is not close to a real leakage point, the data detected by the detection unit continuously has a strong detection signal or is in an alarm state, and therefore the searching of the real leakage point is very difficult.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a suction gun leakage detection device and a leakage detection method.
The suction gun leak detection device of one embodiment of the invention comprises:
the suction gun device comprises a suction gun body and a suction device, the suction device is connected with the inside of the suction gun body, and the suction device provides negative pressure airflow for the suction gun body;
the spray gun device comprises an air injection gun body and an air supply device, the output port of the air injection gun body faces the front end of the output port of the air suction gun body, the air supply device is connected with the inside of the air injection gun body, and the air injection gun body provides positive pressure air flow for the air injection gun body;
and the leakage detecting unit is connected with the air suction device.
According to the suction gun leakage detection device provided by the embodiment of the invention, the spray gun device is arranged in the direction of the output port of the suction gun device, the spray gun device can reduce the concentration of high-concentration leakage detection gas near the output port of the suction gun device, the real leakage point can continuously leak the leakage detection gas, and when the suction gun device moves to the real leakage point, the signal of the detection unit can be obviously enhanced, so that the real leakage point can be accurately found.
In a preferred or alternative embodiment, the lance device further comprises a flow control device disposed on the lance body, the flow control device controlling the flow of the positive pressure gas stream through the interior of the lance body.
In a preferred or alternative embodiment, the flow control device comprises a control valve disposed inside the air lance body.
In a preferred or optional embodiment, the flow control device comprises a flow detection sensor disposed inside the air gun body, and the flow detection sensor detects the flow of the positive pressure air flow inside the air gun body.
In a preferred or optional embodiment, the flow control device further comprises an indicator light electrically connected to the leak detection unit, the indicator light being configured to display a detection signal of the leak detection unit.
In a preferred or optional embodiment, the spray gun device further comprises a manipulator, wherein the output end of the manipulator is connected with the suction gun device and the spray gun device, and the manipulator controls the movement of the suction gun device and the spray gun device.
The invention provides a leak detection method, which comprises the following steps:
the suction gun leakage detecting device is included;
fixing a workpiece to be detected in a detection range of the suction gun leakage detection device;
filling leak detection gas into the workpiece to be detected;
starting negative pressure airflow of the suction gun leakage detecting device to suck air on the surface of the workpiece to be detected and move the workpiece to be detected;
starting positive pressure airflow of the suction gun leakage detection device to blow the surface of the workpiece to be detected;
and the suction gun leakage detecting device detects the negative pressure airflow.
In a preferred or optional embodiment, the negative pressure gas flow of the suction gun leak detection device is started first, the concentration of the leak detection gas of the negative pressure gas flow is detected in real time, when the concentration of the leak detection gas of the negative pressure gas flow is increased to a set value, the positive pressure gas flow of the suction gun leak detection device is started again for blowing, the position with the highest concentration of the leak detection gas is found, and the leak point of the workpiece to be detected is determined.
In a preferred or optional embodiment, the flow rate of the positive pressure gas flow of the gun leak detection apparatus is changed according to the change of the concentration of the leak detection gas detected by the negative pressure gas flow of the gun leak detection apparatus.
In a preferred or optional embodiment, a moving path of the suction gun leak detection device is preset, the moving path is provided with a detection point, and when the suction gun leak detection device is close to the detection point, the suction gun leak detection device generates a preset positive pressure airflow.
In order that the invention may be more clearly understood, specific embodiments thereof will be described hereinafter with reference to the accompanying drawings.
Drawings
FIG. 1 is a first schematic diagram of the overall construction of a hermetic leak detection apparatus of the invention;
FIG. 2 is a second schematic diagram of the overall construction of the hermetic leak detection apparatus of the present invention;
FIG. 3 is a schematic view of the construction of the mouthpiece of the present invention;
FIG. 4 is a cross-sectional view of a mouthpiece of the present invention;
FIG. 5 is a schematic view of another embodiment of a mouthpiece according to the present invention;
FIG. 6 is a cross-sectional view of another mouthpiece of the present invention;
fig. 7 is a schematic diagram of the overall construction of the hermetic leak detection apparatus of the present invention.
The drawings illustrate schematically: 1. a suction gun device; 11. an air suction gun body; 12. a suction device; 2. a spray gun device; 21. an air-jet gun body; 211. a needle-shaped spray head; 22. an air supply device; 23. a flow control device; 3. a leak detection unit; 4. a manipulator; 5. a workpiece to be tested; 6. a blowing nozzle; 61. an air suction passage; 62. an air blowing channel; 63. an air suction port; 64. and an air blowing opening.
Detailed Description
Referring to fig. 1 and 2 together, fig. 1 is a first schematic diagram of the overall construction of the leak detecting apparatus of the invention, and fig. 2 is a second schematic diagram of the overall construction of the leak detecting apparatus of the invention.
The sealing leakage detection device provided by the embodiment comprises a suction gun device 1, a spray gun device 2 and a leakage detection unit 3. The output port of the spray gun device 2 and the output port of the suction gun device 1 are located on the same side, and the leakage detection unit 3 is connected with the air suction device 12.
The suction gun device 1 comprises a suction gun body 11 and a suction device 12, wherein the suction device 12 is connected with the inside of the suction gun body 11, and the suction device 12 provides negative pressure airflow for the suction gun body 11. After the suction gun device 1 is close to the workpiece 5 to be measured, the gas on the surface of the workpiece 5 to be measured can be sucked into the suction gun body 11.
The spray gun device 2 comprises an air injection gun body 21 and an air supply device 22, an output port of the air injection gun body 21 faces the front end of an output port of the air suction gun body 11, the air supply device 22 is connected with the inside of the air injection gun body 21, and the air injection gun body 21 provides positive pressure air flow for the air injection gun body 21. After the spray gun device 2 is close to the workpiece 5 to be measured, positive pressure air flow can be provided to spray the surface of the workpiece 5 to be measured.
Referring to fig. 3 and 4, fig. 3 is a schematic view showing a structure of a mouthpiece according to the present invention, and fig. 4 is a sectional view of the mouthpiece according to the present invention.
In this embodiment, the air suction gun body 11 and the air injection gun body 21 are both disposed on a blowing nozzle 6, an air suction channel 61 is disposed in the middle of the blowing nozzle 6, an air blowing channel 62 is disposed outside the air suction channel 61, an air suction port 63 is disposed in the middle of the front end of the blowing nozzle 6, and a plurality of air blowing ports 64 are disposed around the air suction port 63. The output port of the air suction gun body 21 is connected with the air suction channel 61, and the output port of the air injection gun body 21 is connected with the air blowing channel 62. The negative pressure air flow of the suction gun device 1 enters from the air suction port 63 of the blowing nozzle 6, and the positive pressure air flow of the spray gun device 2 is discharged from the air blowing port 64 of the blowing nozzle 6.
Referring to fig. 5 and 6 together, fig. 5 is a schematic view showing a structure of another mouthpiece of the present invention, and fig. 6 is a sectional view of another mouthpiece of the present invention.
In other embodiments, the air suction opening 63 of the blowing nozzle 6 is not in the same plane with the air blowing opening 64 of the blowing nozzle 6, the air suction opening 63 is located at the front end of the air blowing opening 64, and a plurality of air blowing openings 64 surround the air suction opening 63. The air suction gun body 11 and the air injection gun body 21 may be tubular bodies arranged in parallel.
Preferably, the lance device 2 further includes a flow control device 23, the flow control device 23 is provided on the lance body 21, and the flow control device 23 controls the flow rate of the positive pressure gas flow flowing through the inside of the lance body 21. The outlet of the air gun body 21 is provided with a needle-shaped nozzle 211, and the needle-shaped nozzle 211 faces the front end of the air suction gun body 11. The outer diameter of the output port of the needle-shaped nozzle 211 is small, and the needle-shaped nozzle 211 can enter a narrow space, so that the adaptability of the spray gun device 2 is improved, and the accuracy of the positive pressure air flow of the spray gun device 2 is improved.
More preferably, the spray gun device 2 further includes a pressure sensor, the pressure sensor is disposed inside the air injection gun body 21, the pressure sensor measures a pressure value of the positive pressure air flow inside the air injection gun body 21 in real time, and it can be detected whether the air injection gun body 21 is in a normal working state.
The flow control device 23 includes a control valve, a flow detection sensor, and an indicator lamp.
The control valve is arranged inside the air gun body 21. In this embodiment, the control valve controls the cross-sectional area of the inside of the air gun body 21 to change the flow rate of the positive pressure air flow. In other embodiments, the control valve can change the flow rate of the positive pressure air stream by changing the internal formation of the air gun body 21.
The flow rate detection sensor is arranged inside the air gun body 21, and the flow rate detection sensor detects the flow rate of the positive pressure air flow inside the air gun body 21.
The indicator light is electrically connected with the leak detection unit 3, and the indicator light is used for displaying a detection signal of the leak detection unit 3.
The workpiece 5 to be detected is filled with a leak detection gas, the leak detection gas is halogen gas, helium gas, hydrogen gas or other detectable media, and correspondingly, the detection unit is a halogen gas detector, a helium mass spectrometer leak detector, a hydrogen detector or other detection devices.
Referring to fig. 7, fig. 7 is a schematic diagram of the overall structure of the hermetic leak detection apparatus of the present invention.
In this embodiment, the suction gun leakage detecting device further includes a manipulator 4, an output end of the manipulator 4 is connected with the suction gun device 1 and the spray gun device 2, and the manipulator 4 controls the movement of the suction gun device 1 and the spray gun device 2. The robot 4 can preset the moving paths of the gun suction device 1 and the gun spray device 2. In other embodiments, the gun leak detector may be operated by a user's hand, and the robot 4 is not necessarily used.
When the workpiece 5 to be detected has large leakage (large leakage hole or gap) to a certain degree, a large amount of leakage detection gas exists near the leakage hole due to the diffusion of the gas, under the condition, when the suction gun device 1 is not close to a real leakage point, the data detected by the detection unit continuously has a strong detection signal or is in an alarm state all the time, and therefore the searching for the real leakage point is very difficult.
The spray gun device 2 is arranged in the direction of the output port of the suction gun device 1, the spray gun device 2 can reduce the concentration of high-concentration leakage detection gas near the output port of the suction gun device 1, real leakage points can continuously leak the leakage detection gas, and when the suction gun device 1 moves to the real leakage points, signals of the detection unit can be obviously enhanced, so that the real leakage points can be accurately found.
The embodiment also provides a leakage detection method which comprises the suction gun leakage detection device.
The leak detection method comprises the following steps:
s1: and fixing the workpiece 5 to be detected in the detection range of the suction gun leakage detection device, and fixing the workpiece 5 to be detected by utilizing an or workbench clamp.
S2: filling leak detection gas into the workpiece 5 to be detected, preferably, a filler is arranged in the workpiece 5 to be detected, and the filler reduces the residual space in the workpiece 5 to be detected, so that the leak detection gas is saved;
s3: starting negative pressure airflow of the suction gun leakage detecting device to suck air on the surface of the workpiece 5 to be detected and move the workpiece 5 to be detected;
s4: starting positive pressure airflow of the suction gun leakage detecting device to blow the surface of the workpiece 5 to be detected;
s5: and the suction gun leakage detecting device detects the negative pressure airflow.
The above-mentioned detection sequence is not necessarily performed in steps, and the steps S3 and S4 may be performed simultaneously.
In one embodiment, the negative pressure gas flow of the suction gun leak detection device is started first, the concentration of the leak detection gas of the negative pressure gas flow is detected in real time, when the concentration of the leak detection gas of the negative pressure gas flow is increased to a set value, the positive pressure gas flow of the suction gun leak detection device is started again for blowing, the position with the highest concentration of the leak detection gas is found, and the leak point of the workpiece 5 to be detected is determined. When the suction gun leak detection device is close to the position with high concentration of leak detection gas, the moving speed of the suction gun leak detection device is reduced, and the detection accuracy of the suction gun leak detection device is improved.
When the suction gun leakage detecting device detects that the concentration of the leakage detecting gas reaches a certain set value, the air blowing is started for preventing continuous upper limit alarm, and the air blowing is not started when the concentration of the leakage detecting gas does not reach the set value. Because the leak rate is less, blow can influence leak hunting precision.
In some embodiments, the flow rate of the positive pressure gas stream of the gun leak detection apparatus varies in accordance with a change in the concentration of the leak detection gas detected by the negative pressure gas stream of the gun leak detection apparatus. The air flow change mode of the positive pressure air flow can be various, such as change according to wave shape or intermittent change.
In some embodiments, a moving path of the suction gun leak detection device is preset, the moving path is provided with a detection point, and when the suction gun leak detection device is close to the detection point, the suction gun leak detection device generates a preset positive pressure airflow. And a preset moving path of the suction gun leakage detecting device is set according to the shape and the position of the workpiece 5 to be detected. The detection point is a high-frequency detection point of the workpiece 5 to be detected, which is easy to leak, and the suction gun leak detection device changes the positive pressure airflow when approaching the detection point, such as strengthening the airflow or changing the airflow change mode.
The suction gun leakage detection device is used for blowing not only the surface of a workpiece to be detected, but also blowing near the output port of the suction gun body 11, controlling and desalting the concentration value of near gas of the output port of the suction gun body 11 according to the adjustment of the blowing flow, so as to prevent continuous alarm caused by overhigh concentration of leakage detection gas sucked by the suction gun body 11 or prevent the output port of the suction gun body 11 from reaching the pipeline of the leakage detection unit 3 from being gathered by high-concentration gas, and a real leakage point cannot be quickly found.
The leak detection method further comprises a control center, wherein the control center can be a component commonly used by technicians in the field such as a PLC (programmable logic controller), a singlechip and the like, and the control center has the main functions in the example:
1. judging whether the blowing function is started or not according to the received leakage rate signal, transmitting a signal to the flow control device, and controlling the blowing flow;
2. converting the received leakage rate and the blowing flow rate to obtain a real leakage rate;
3. the true leak rate is communicated to a display device.
In a conventional detection method of a suction gun leak detector, when a specific condition (in the case of a large workpiece leakage) reaches an upper limit value of the concentration of the leak detector, it is difficult to find an accurate leak point because the workpiece leakage is large and the periphery of the leak point is already covered with a high-concentration leak detection gas.
In this patent, the suction gun leak detection device and the leak detection method function as follows:
1. the problem that accurate leakage points cannot be found due to the fact that the leak detector is polluted by high-concentration leak detection gas can be effectively solved;
2. the air blowing flow value can be automatically adjusted according to the detected concentration value of the leakage detection gas, the strength of a signal detected by the leakage detector is directly influenced by the difference of the air blowing flow values, and when a workpiece is in small leakage or micro leakage (the concentration of the leakage detection gas at the leakage point of the workpiece is low), the air blowing function does not need to be started; when the leakage rate (high concentration of the gas detected near the workpiece) is detected, the blowing function is started, and the flow value of blowing is automatically adjusted according to the detected leakage rate value;
3. coefficient conversion can be carried out according to the flow value of the blown air and the leakage rate value obtained by leakage detection, and when an accurate leakage point is found, the real leakage rate of the workpiece can be obtained. The common leak detector and the leak detection method report that the leakage rate is greater than a certain value after exceeding the upper limit, for example, the leakage rate is greater than 8 x 10 < -2 > mbar.L/s, the real leakage rate cannot be known, and when the leakage rate of a workpiece is larger, the leakage detector also reports that the leakage rate is greater than 8 x 10 < -2 > mbar.L/s because the concentration of gas around the leakage point exceeds the upper limit, so the real leakage point is difficult to find.
The present invention is not limited to the above-described embodiments, and various modifications and variations of the present invention are intended to be included within the scope of the claims and the equivalent technology of the present invention if they do not depart from the spirit and scope of the present invention.

Claims (10)

1. A suction gun leak detection device is characterized by comprising:
the suction gun device comprises a suction gun body and a suction device, the suction device is connected with the inside of the suction gun body, and the suction device provides negative pressure airflow for the suction gun body;
the spray gun device comprises an air injection gun body and an air supply device, the output port of the air injection gun body faces the front end of the output port of the air suction gun body, the air supply device is connected with the inside of the air injection gun body, and the air injection gun body provides positive pressure air flow for the air injection gun body;
and the leakage detecting unit is connected with the air suction device.
2. The suction gun leak detection apparatus according to claim 1, characterized in that:
the spray gun device further comprises a flow control device, the flow control device is arranged on the air injection gun body, and the flow control device controls the flow of the positive pressure air flow flowing through the inside of the air injection gun body.
3. The suction gun leak detection apparatus according to claim 2, characterized in that:
the flow control device comprises a control valve which is arranged inside the air injection gun body.
4. The suction gun leak detection apparatus according to claim 2, characterized in that:
the flow control device comprises a flow detection sensor, the flow detection sensor is arranged inside the air injection gun body, and the flow detection sensor detects the flow of the positive pressure air flow inside the air injection gun body.
5. The suction gun leak detection apparatus according to claim 2, characterized in that:
the flow control device also comprises an indicator light which is electrically connected with the leak detection unit and is used for displaying a detection signal of the leak detection unit.
6. The suction gun leak detection apparatus according to any one of claims 1 to 5, characterized in that:
the automatic spraying device is characterized by further comprising a manipulator, wherein the output end of the manipulator is connected with the gun suction device and the spraying gun device, and the manipulator controls the gun suction device and the spraying gun device to move.
7. A leak detection method is characterized in that: a suction gun leak detection device comprising the suction gun leak detection device according to any one of claims 1 to 6;
fixing a workpiece to be detected in a detection range of the suction gun leakage detection device;
filling leak detection gas into the workpiece to be detected;
starting negative pressure airflow of the suction gun leakage detecting device to suck air on the surface of the workpiece to be detected and move the workpiece to be detected;
starting positive pressure airflow of the suction gun leakage detection device to blow the surface of the workpiece to be detected;
and the suction gun leakage detecting device detects the negative pressure airflow.
8. Leak detection method according to claim 7, characterized in that:
and firstly starting the negative pressure airflow of the suction gun leakage detecting device, detecting the concentration of leakage detecting gas of the negative pressure airflow in real time, starting the positive pressure airflow of the suction gun leakage detecting device to blow when the concentration of the leakage detecting gas of the negative pressure airflow is increased to a set value, finding the position with the highest concentration of the leakage detecting gas, and determining the leakage point of the workpiece to be detected.
9. Leak detection method according to claim 7, characterized in that:
the flow of the positive pressure gas flow of the suction gun leakage detecting device is changed according to the change of the concentration of the leakage detecting gas detected by the negative pressure gas flow of the suction gun leakage detecting device.
10. Leak detection method according to claim 7, characterized in that:
presetting a moving path of the suction gun leakage detecting device, wherein the moving path is provided with a detection point, and when the suction gun leakage detecting device is close to the detection point, the suction gun leakage detecting device generates preset positive pressure airflow.
CN202010844979.6A 2020-08-20 2020-08-20 Suction gun leakage detection device and leakage detection method Pending CN111912578A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010844979.6A CN111912578A (en) 2020-08-20 2020-08-20 Suction gun leakage detection device and leakage detection method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010844979.6A CN111912578A (en) 2020-08-20 2020-08-20 Suction gun leakage detection device and leakage detection method

Publications (1)

Publication Number Publication Date
CN111912578A true CN111912578A (en) 2020-11-10

Family

ID=73278509

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010844979.6A Pending CN111912578A (en) 2020-08-20 2020-08-20 Suction gun leakage detection device and leakage detection method

Country Status (1)

Country Link
CN (1) CN111912578A (en)

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